Alright, let's work through 1520 times 4107 step by step
1520 × 4107 = 4107 × (1520)
+ 4107 × 0 yielding 0
+ 4107 × 20 giving us 82140
+ 4107 × 500 giving us 2053500
+ 4107 × 1000 what gives us 4107000

= 6242640
